メタデータ名 polygon
<http://xmlns.oracle.com/rdf/geo/srid/4612> POLYGON((142.390424238466 44.1821199707942, 142.390448790835 44.1820448262784, 142.391312010258 44.1821775959803, 142.390947594834 44.1833563697682, 142.390088069104 44.1832017758282, 142.390272837768 44.1825833120421, 142.388788412424 44.182377594252, 142.388932365352 44.181874130634, 142.390424238466 44.1821199707942)) ^^http://www.opengis.net/ont/geosparql#wktLiteral